Improvement in cylinder printing-machines



v H. B. DENNY; Cylinder Printing-Machine.

No; 213,098 j Patented Mar. 11, 1879.

@5- 'ii iiiii'l (LPETEP-S, PHOTO-JYHOGRAPHER WASHINGTON D C UNITEDSTATES ATENT FFICE.

HERVEY B. DENNY, OF CIRCLEVILLE, OHIO.

IMPROVEMENT IN CYLINDER PlRlNTlNG-MACHINES.

Specification forming part of Letters Patent No. 213,098, dated March11, 1879; application filed October 8, 1878.

To all whom it may concern:

Be it known that I, HERVEY B. DENNY, of Oircleville, in the county ofPickaway and State of Ohio, have invented certain new and usefulImprovements in Cylinder Printing- Machines; and I do hereby declarethat the following is a full, clear, and exact description oftheinvention which will enableothers skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of. this specification.

My invention is an improvement in the machinery by which a drum-cylinderpress is opera-ted.

It consists, first, in substituting for the shaft and rack motion now inuse of a wheel formed of two segments of different radii, a smallconnectin g or reversing spurwheel, and a rack on the edge of thetype-bed, by which a reciprocating movement is given to the type -bedwhile the impressioncylinder moves, rotating about an axis in commonwith the axis of the segmental wheel.

' It consists, secondly, in the use of two sets of fingers-0r nippers,in connection with an impression-cylinder, one set of which receives Ithe sheet to be printed when it'is at, rest, and

moves while delivering it to the other set, which hold it during theoperation of printing, as will be hereinafter described.

In my drawings, Figure 1 is a plan view of my invention. Fig. 2 is aside elevation, looking toward the cylinder. Fig. 3is a sectional view,showing the relation of the segmental wheel to the rack, cylinder, 850.Fig. 4 is a detached section, showing the relation of the nippers to thecylinder.

Similar reference-letters indicate like parts in all of the figures.

Referring to drawings, A is the toothed wheel, composed of two segments,a I), firmly fixed together, and hung upon a shaft, 1), about which itand the impression-cylinder revolve. This segmental wheel is constructedby taking two half spur-wheels and joiningthem together so that theywill be side by side on the shaft 7), but arranged with reference toeach other so that their functional continuity will be broken. Thesesegments need not necessarily be of the same radii; but by having themunequal, as described, the connecting or reversingwheel B will bebrought nearer to the center of the double segmental wheel and theconstruction rendered more compact. If the segments are made of equalradii, and a corresponding part of the rack lowered, the wheel B mustnecessaril y be placed distant from. the center of said wheel A and alonger rack provided. The two segments need not necessarily be of equalproportions as to length of are, as shown, but may be varied in thisrespect, always keeping in view, however, to provide sufficient toothedsurface to give a proper reciprocating movement to the type-bed.

The segmental wheel A is provided with a lug or proj ection,.c, whichengages with a similar log or projection, W, on the rack, to insure theproper meshing of the wheel and rack, in connection with a swinginglever on the rack G, which is rigidly secured to the type-bed.

B is a plain spur-wheel, connecting the seg mental wheel and the rack,by which a reverse motion is given to the type-bed. O is a rack, ofordinary construction, with width sufficient to be within reach of theinner segment, a, and the reversing-wheel engaged by the outer segment,1). It may be made by placing two racks side by side, as shown in thedrawings, or con structed of a single piece. It is provided at theforward end with a lug, b against which a similar lug on the wheel Astrikes to insure proper meshing of the rack and segment I). To assistin a proper meshing of the segment and wheel B, I provide a V-notchedprojection, b extending up from the side of the rack O, which is engagedby a pin, g, on the said segment a. Immediately in the rear of this lugis a latch or lever, K, which the lug c on the segmental Wheel depressesas it passes by, after which said latch rises to prevent the unmeshingof the rack and wheel, and also prevents the press from being turnedbackward.

I) is a toothed wheel, rigidly attached to the double segmental wheel A,with which it moves. D is a worm or screw gearing with wheel D, attachedto the cylinder Eby suitable journal-bearin gs. This screw or worm isprovided with a head, of a proper form, to receive a key by which saidscrew may be moved.

The segmental wheel A, spur-wheel D, and rack 0 always preserve the samerelation to each other; but as it is sometimes desirable, for thepurpose of getting register, &c., to change the relation existingbetween the cylinder and type-bed, such changemay be effected by turningthe screw or worm D to move the impression-cylinder to produce thedesired change in the register. I mean by register the perfect backingof two bookpages, or the equal division of margin on the sheet. Toillustrate: suppose a form is placed on a press and properly secured tothe typebed, and an impression taken, the impression is found to have,say, one inch margin on one side and four inches on the other.

To equalize the margins in my press, I use the screw D and spur-wheel Dto bring about a proper relation between the impression-cylinder and thetype-bed, and by means of a lock-nut applied to the head of said screw Ipreserve this relation during the operation of printing.

After the adjustment in my press, by a locknut on the screw motion maybe prevented to the register device while the press is inoperation.

In presses as now constructed only one set of fingers or nippers areused, and they are attached to the cylinder and move with it. It thepress is run at an unequal speed, the time at which these nippers takehold of the sheet to be printed varies, and poor register is the result.To obviate this difficulty I use two sets of fingers. The first settakes hold of the sheet when it and the sheet are at rest. The secondset, which is attached to the cylinder, takes the sheet from the firstand holds it until it is printed. As the first set receives motion fromthe cylinder at the time the transfer is made, it always moves with itat about the same speed, and perfect register is the result.

In the drawings but one set of nippers of each kind is shown, althoughin practice any desired number may be employed.

In my drawings, F represents the receivingnippers; G, thecarrying-nippers; I, the spring that draws the nippers F back to theirplace; K, the cam which pushes them forward while the transfer of thesheet is being made, and

holds them until they return for the next sheet.

The nippers F are closed by contact with the cylinder or a spring, a,and opened by their own weight, aided by a spring when necessary. Thecylinder-nippers are similar to those now in use, and require noexplanation.

The operation of the press is as follows: A sheet is laid on thefeed-board with the forward edge between the nippers F and its side edgeagainst the stop or gage (I. As the cyl inder makes a revolution, at theproper time the nippers F are closed. and then swung forward at the samespeed at which the cylinder moves. The fingers on the cylinder now takehold of the sheet, and at the same time the nippers F, continuing theirforward movement, let go and are withdrawn from contact with the sheet.The sheet is carried around with the cylinder and receives itsimpression from the type as it moves.

As the cylinder and bed are geared together,

the register being first regulated by the worm j and gear D D, accurateregister is secured.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. In a printing-press, the impression-cylinder E and the wheel A,formed of two separate segments, a. 11 hung on the shaft on which saidcylinder rotates, in combination with the rack (J and spur-wheel B, asand for the purpose specified.

2. The impression-cylinderE and the toothed wheel A, composed ofsegments a I), having a lug, c, projecting from it, in combination withwheel B and rack 0, provided with lug b and latch K, as and for thepurpose set forth.

3. The nippers F and G, in combination with the cam K, fixed to thecylinder E, said nippers F receiving motion from said cams whiledelivering the sheet to said nippers G, as described, for the purposeset forth.

In testimony that I claim the ioregoing as my own I affix my signaturein presence of two witnesses.

HERVEY B. DENNY.

Witnesses:

JOHN PIGKERING, J. C. ANDERSON.

